code: def run(self):
      # Incrementing an attribute gets reflected in the `Flow` state.
      self.counter += 1
  
file_path: pytorch-lightning/docs/source-app/core_api/lightning_app/app.py
imports: from lightning.app import LightningWork, LightningFlow, LightningApp
  from lightning.app.utilities.app_helpers import pretty_state
label_desc: Use image node_id 2 for calling the Work obj's underlying member method code with example usage: obj.run() without return types